Fix relocation packing in GN

build/android/gyp/pack_arm_relocations.py

 #!/usr/bin/env python
 #
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Pack ARM relative relocations in a library (or copy unchanged).
 
 If --enable-packing and --configuration-name=='Release', invoke the
 relocation_packer tool to pack the .rel.dyn or .rela.dyn section in the given
@@ skipping 71 matching lines @@
       default='',
       help='Names of any libraries explicitly not packed')
   parser.add_option('--android-pack-relocations',
       help='Path to the ARM relocations packer binary')
   parser.add_option('--android-objcopy',
       help='Path to the toolchain\'s objcopy binary')
   parser.add_option('--stripped-libraries-dir',
       help='Directory for stripped libraries')
   parser.add_option('--packed-libraries-dir',
       help='Directory for packed libraries')
-  parser.add_option('--libraries',
+  parser.add_option('--libraries', action='append',
       help='List of libraries')
   parser.add_option('--stamp', help='Path to touch on success')
 
   options, _ = parser.parse_args(args)
   enable_packing = (options.enable_packing == '1' and
                     options.configuration_name == 'Release')
   has_relocations_with_addends = (options.has_relocations_with_addends == '1')
   exclude_packing_set = set(shlex.split(options.exclude_packing_list))
 
-  libraries = build_utils.ParseGypList(options.libraries)
+  libraries = []
+  for libs_arg in options.libraries:
+    libraries += build_utils.ParseGypList(libs_arg)
 
   if options.clear_dir:
     build_utils.DeleteDirectory(options.packed_libraries_dir)
 
   build_utils.MakeDirectory(options.packed_libraries_dir)
 
   for library in libraries:
     library_path = os.path.join(options.stripped_libraries_dir, library)
     output_path = os.path.join(
         options.packed_libraries_dir, os.path.basename(library))
@@ skipping 13 matching lines @@
         libraries + build_utils.GetPythonDependencies())
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))